You are killing me...just one? lol. I would have to say aquaphor, I know its not really a beauty product, but I use it as an eye creme, lip balm, to keep hair dye off my skin etc etc. I would be lost without it!

I love mac make up but 2 years ago i quickly grabbed a £2 black eyeliner from primarks to use on the go as i was going out that night and didnt have time to get to a boots/superdrugs etc. Its a really big chunky pencil and is soft enough that it doesent scrap my eye lids and leaves a really nice line which does not rub off right away. I havent brought another brand of eyeliner since if im honest x